There is another option available for storing ‘all’ of your snaps which, having been forced to find more space for /var/snap, seems to be working. (Saying seems because I don’t have long term usage for proof just that everything seems to be working after the change.)
(At a mentor’s (an old time unix geek) suggestion!)
First make sure that ALL of your containers have been stopped.
Copy /var/snap to another directory that has lots (LOTS!!!) of space in it.
Then you need to rm -r the original.
Lastly you need to create a hard link between /var/snap to /mynewdirectory/snap - - - I used $ ln -s /mynewdirectory/snap /var/snap .
I now did a reboot using shutdown -r now to clear any caches and to set things (as advised by my mentor).
(After the reboot completes.) You now need to start all your containers.
Should be working (at least in my case everything is working - - - grin!).