code: func SetSnifferTimeoutStartup(timeout time.Duration) ClientOptionFunc {
  	return func(c *Client) error {
  		c.snifferTimeoutStartup = timeout
  		return nil
  	}
  }
docs: // SetSnifferTimeoutStartup sets the timeout for the sniffer that is used
  // when creating a new client. The default is 5 seconds. Notice that the
  // timeout being used for subsequent sniffing processes is set with
  // SetSnifferTimeout.