Can't find the spi interface

Sure, here is the output

Slot                      Plug
:account-control          -
:adb-support              -
:alsa                     -
:autopilot-introspection  -
:block-devices            -
:bluetooth-control        -
:broadcom-asic-control    -
:browser-support          -
:camera                   -
:can-bus                  -
:cifs-mount               -
:classic-support        -
:core-support             -
:cpu-control              -
:daemon-notify            -
:dcdbas-control           -
:device-buttons           -
:display-control          -
:docker-support           -
:dvb                      -
:firewall-control         -
:framebuffer              -
:fuse-support             -
:gpg-keys                 -
:gpg-public-keys          -
:gpio-memory-control      -
:greengrass-support       -
:hardware-observe         -
:hardware-random-control  -
:hardware-random-observe  -
:home                     -
:hostname-control         -
:io-ports-control         -
:joystick                 -
:kernel-module-control    -
:kernel-module-observe    -
:kubernetes-support       -
:kvm                      -
:log-observe              -
:lxd-support              -
:mount-observe            -
:netlink-audit            -
:netlink-connector        -
:network                  -
:network-bind             -
:network-control          -
:network-observe          -
:network-setup-control    -
:network-setup-observe    -
:opengl                   -
:openvswitch-support      -
:personal-files           -
:physical-memory-control  -
:physical-memory-observe  -
:ppp                     -
:process-control          -
:raw-usb                  -
:removable-media          -
:shutdown                 -
:snapd-control            -
:ssh-keys                 -
:ssh-public-keys          -
:system-files             -
:system-observe           -
:system-trace             -
:time-control             -
:timeserver-control       -
:timezone-control         -
:tpm                      -
:u2f-devices              -
:uhid                     -
network-manager:service   -
pi3:bcm-gpio-0            -
pi3:bcm-gpio-1            -
pi3:bcm-gpio-10           -
pi3:bcm-gpio-11           -
pi3:bcm-gpio-12           -
pi3:bcm-gpio-13           -
pi3:bcm-gpio-14           -
pi3:bcm-gpio-15           -
pi3:bcm-gpio-16           -
pi3:bcm-gpio-17           -
pi3:bcm-gpio-18           -
pi3:bcm-gpio-19           -
pi3:bcm-gpio-2            -
pi3:bcm-gpio-20           -
pi3:bcm-gpio-21           -
pi3:bcm-gpio-22           -
pi3:bcm-gpio-23           -
pi3:bcm-gpio-24           -
pi3:bcm-gpio-25           -
pi3:bcm-gpio-26           -
pi3:bcm-gpio-27           -
pi3:bcm-gpio-3            -
pi3:bcm-gpio-4            -
pi3:bcm-gpio-5            -
pi3:bcm-gpio-6            -
pi3:bcm-gpio-7            -
pi3:bcm-gpio-8            -
pi3:bcm-gpio-9            -
pi3:bt-serial             -
pi3:i2c-0                 -
pi3:i2c-1                 -
pi3:i2c-2                 -
wifi-ap:control         -

Thanks for the support.

One additional note: When I check /snap/pi3/current/meta/snap.yaml I see the spi interfaces

  spidev0.0:
    interface: spi
    path: /dev/spidev0.0
  spidev0.1:
    interface: spi
    path: /dev/spidev0.1