[Bug-cpio] -tv group names truncated

[積丹尼 Dan Jacobson]

There is no way given for a -tv user to determine which of
$ grep systemd- /etc/group
systemd-journal:x:111:
systemd-timesync:x:112:
systemd-network:x:113:
systemd-resolve:x:114:
a file is!
# k=/tmp/g; touch $k; chgrp systemd-timesync $k; ls $k|cpio -o|cpio -tv
1 block
-rw-r--r--   1 root     systemd-        0 Oct 21 04:23 /tmp/g
1 block

I bet the same happens with the owner.
$ cpio --version
cpio (GNU cpio) 2.11

I can't read the Info page because I am offline while writing this,
and the Info page is only available online in Debian do to cpio's legal issues.