vm4sparc: mounting a filesystem from a guest domain in the primary domain for backup

dear all

i have a T3-1 with a vm server for sparc version 2.1
there i have 3 guest domains running 3 different networks.
this ldom's are using a ZFS volume as described in 821-2854-4.pdf ( page 101 )

i want to have access within the primary domain to the other file systems for backup reasons.
for example this is an extract for one ldom:
# zfs list | grep ldg2
rpool/ldoms/ldg2                     52.6G  57.7G    21K  /ldoms/ldg2
rpool/ldoms/ldg2/disk0               52.6G  88.7G  21.6G  -

i can create snapshots, but i cannot see any content ( the snapshot is visible "set snapdir=visible" )
i also tried to send and receive the snapshot, but than i cannot mount it. and of course it takes space from the disk.