code: def strip_tsft(self, idx):
          
          idx = Radiotap.align(idx, 8)
          mactime, = struct.unpack_from('<Q', self._rtap, idx)
          return idx + 8, mactime
docs: strip(8 byte) radiotap.mactime
          :idx: int
          :return: int
              idx
          :return: int
              mactime