when zdb dumps out the znode_phys info it should include the uid/gid and if the uid/gid is a FUID it should include the SID.
I'm thinking it should look something like this:
path /New Wordpad Document.doc/<xattrdir>
atime Mon Jan 14 13:26:17 2008
mtime Mon Jan 14 13:26:15 2008
ctime Mon Jan 14 13:26:15 2008
crtime Mon Jan 14 13:26:15 2008
gen 837
mode 41777
uid 0x100000472 [S-1-5-21-940912991-1138591764-871648236-1138]
gid 0xa
size 2
parent 9
links 2
xattr 0
rdev 0x0000000000000000
microzap: 512 bytes, 0 entries