Share a ZFS file system over SMB/CIFS and advertise it via mDNS so that it shows up in the OS X Finder. Assumes SmartOS, but should work fine on any illumos distribution.
# Create volume
zfs create zones/store
# Allow guest access to a trusted subnet
zfs set sharesmb=rw=10.10.1.0/22,guestok=true,name=store zones/store
# Advertise the SMB service, it will now show up in Finder