I found out today something I am sure to forget.

In every zfs dataset there is an invisible directory (by invisible, I mean that it does NOT show up with ls -a) name .zfs. In side this directory are two subdirectories, shares and snapshots.

The snapshots subdirectory is a perfectly serviceable read-only access to all the snapshots. Viz:

root@cinnamon:~# ls -al /backups/.zfs/snapshot
 total 0
 drwxrwxrwx 2 root root 2 Sep 11 05:07 .
 drwxrwxrwx 1 root root 0 Sep  5 16:42 ..
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190829
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190830
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190903
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190904
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190905
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190906
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190907
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190908
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190909
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190910
 drwxrwxrwx 1 root root 0 Sep 11 10:05 190911