Change the default group of zfs filesystem

Sorry but one more zfs question!

How can I change the default group from a zfs root filesystem? If I run:
# chgrp -r <mygroup> /<myZfs>
all ACL entries are lost the more the ACL entry for the group is changed.

May chgrp is not the right command for the change, but what should I use insead of it?
 
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