code: func (e *endpoint) maybeEnableTimestamp(synOpts *header.TCPSynOptions) {
  	if synOpts.TS {
  		e.sendTSOk = true
  		e.recentTS = synOpts.TSVal
  	}
  }
docs: // maybeEnableTimestamp marks the timestamp option enabled for this endpoint if
  // the SYN options indicate that timestamp option was negotiated. It also
  // initializes the recentTS with the value provided in synOpts.TSval.