_X_MTIME
if ((xhdr_flgs & _X_MTIME))
timebuf[1].tv_usec = (xhdr_flgs & _X_MTIME) ? modTime.tv_nsec/1000 : 0;
_X_MTIME, "mtime",
case _X_MTIME:
xhdr_flgs |= _X_MTIME;
if (flag & _X_MTIME) {