be_add_children_callback
ret = zfs_iter_filesystems(zhp, be_add_children_callback, &cb);
be_add_children_callback, cb);
ret = zfs_iter_filesystems(zhp, be_add_children_callback, cb);
ret = zfs_iter_children(zhp, be_add_children_callback, cb);
ret = zfs_iter_filesystems(zhp, be_add_children_callback, cb);
static int be_add_children_callback(zfs_handle_t *zhp, void *data);