The following filesystem versions are supported:

VER  DESCRIPTION
---  --------------------------------------------------------
 1   Initial ZFS filesystem version
 2   Enhanced directory entries
 3   Case insensitive and File system unique identifer (FUID)
 4   userquota, groupquota properties

For more information on a particular version, including supported releases, see:

http://www.opensolaris.org/os/community/zfs/version/zpl/N

Where 'N' is the version number.
