zfs dataset mountpoints moved to /var/lib/snapd/hostfs

Here are the mountpoints, after I moved them out of /var/lib/snapd/hostfs.

: kai@cakepile kai; zfs mount -l
square/postgresql               /var/lib/postgresql-square
square/docker                   /var/lib/docker-square
square/avahi-captures           /mnt/avahi-captures
square/mn                       /mn
square/mn/elasticsearch-staging  /mn/elasticsearch-staging
square/mn/etcd-foo              /mn/etcd-foo
square/mn/minio                 /mn/minio
square/mn/pg-staging            /mn/pg-staging
square/mn/postgres-a            /mn/postgres-a
square/mn/postgres-b            /mn/postgres-b
square/mn/redis-staging         /mn/redis-staging
square/mn/rels.sqlite           /mn/rels.sqlite
square/mn/wal-g-test            /mn/wal-g-test

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I initially thought this was a snapd issue (hey, snapd stole my zfs mounts!), but I think those are supposed to be bind mounts.

I also looked at the zfsutils-linux changelog and recent patches but didn't see anything that seemed suspicious to me.