Compare time stamps of two files and return True
        if file1 (source) is more recent than file2 (target)

def _cmptimestamps(self, filest1, filest2):
        """ Compare time stamps of two files and return True
        if file1 (source) is more recent than file2 (target) """

        mtime_cmp = int((filest1.st_mtime - filest2.st_mtime) * 1000) > 0
        if self._use_ctime:
            return mtime_cmp or \
                   int((filest1.st_ctime - filest2.st_mtime) * 1000) > 0
        else:
            return mtime_cmp