ZFS Implementation in CFacter: https://github.com/sebastian-miclea/facter/blob/3.13.x/lib/src/facts/resolvers/zfs_resolver.cc#L38
-bash-3.2# /opt/puppetlabs/puppet/bin/facter zpool_featurenumbers zpool_version
zpool_featurenumbers => 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32
zpool_version => 32