While installing a pkg_install packaged version of perl5, I discovered that
the mtree file it contained wasn't acceptable to the mtree program.  The
mtree file specified some file times for directories, giving them as
time=NR_OF_SECONDS; it turns out that mtree (now?) wants them as
time=NR_OF_SECONDS.NR_OF_NANOSECONDS .  Was this a recent change to mtree,
and if so, could mtree possibly be changed again to consider the .nanoseconds
optional?