code: func hostNetworkSystemFromHostSystemID(client *govmomi.Client, hsID string) (*object.HostNetworkSystem, error) {
  	hs, err := hostsystem.FromID(client, hsID)
  	if err != nil {
  		return nil, err
  	}
  	return hostNetworkSystemFromHostSystem(hs)
  }
docs: // hostNetworkSystemFromHostSystemID locates a HostNetworkSystem from a
  // specified HostSystem managed object ID.