====== ZFS Admin-Aufgaben delegieren ======
  useradd -m user1
  zfs create -p tp1/srv/user1
  zfs allow -u user1 compression tp1/srv/user1
  zfs allow tp1/srv/user1
  zfs set compression=off tp1/srv/user1

als user1:
  su - user1
  zfs get compression tp1/srv/user1
-> geht
  zfs set compression=off tp1
-> permission denied
  zfs set atime=off tp1/srv/user1
-> permission denied