Yes we can!
It’s already all written up in nice manual pages, so here you go:
The bottom line is: only works with ZFS. Why? Because
"OS X" ACLs = AFP ACLs ~= NFSv4 ACLs = ZFS ACLs != "Draft POSIX 1e" ACLs
Update (6th November 2010):
Starting with Netatalk 2.2, there’ll be support for POSIX 1e ACLs on Linux available. See the manual for further details.