code: function teardown (server, services, cb) {
    if (!Array.isArray(services)) services = [services]
  
    services = services.filter(function (service) {
      return service._activated // ignore services not currently starting or started
    })
  
    var records = flatten.depth(services.map(function (service) {
      service._activated = false
      var records = service._records()
      records.forEach(function (record) {
        record.ttl = 0 // prepare goodbye message
      })
      return records
    }), 1)
  
    if (records.length === 0) return cb && cb()
  
    server.unregister(records)
  
    // send goodbye message
    server.mdns.respond(records, function () {
      services.forEach(function (service) {
        service.published = false
      })
      if (cb) cb.apply(null, arguments)
    })
  }
docs: Stop the given services
  
  Besides removing a service from the mDNS registry, a "goodbye"
  message is sent for each service to let the network know about the
  shutdown.