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Calls C<utime> on the path or perl file handle and passes a true value to
the callback on success.

The special case of both C<$atime> and C<$mtime> being C<undef> sets the
times to the current time, on systems that support this.

Example: try to touch F<file>.

   aio_utime "file", undef, undef, sub { };

=item aio_chown $fh_or_path, $uid, $gid, $cb->($success)

Calls C<chown> on the path or perl file handle and passes a true value to
the callback on success.

If C<$uid> or C<$gid> can be specified as C<undef>, in which case the
uid or gid of the file is not changed. This differs from Perl's C<chown>
built-in, which wants C<-1> for this.

Example: update the group of F<file> to 0 (root), but leave the owner alone.

   aio_chown "file", undef, 0, sub {
      @_
         or return AE::log error => "chown 'file': $!";
   };

=item aio_chmod $fh_or_path, $perms, $cb->($success)