guid_to_name_cb
err = zfs_iter_children(zhp, guid_to_name_cb, gtnd);
err = zfs_iter_bookmarks(zhp, guid_to_name_cb, gtnd);
int err = guid_to_name_cb(zfs_handle_dup(zhp), >nd);
err = zfs_iter_children(zhp, guid_to_name_cb, >nd);
err = zfs_iter_bookmarks(zhp, guid_to_name_cb, >nd);