code: func hostPortGroupFromName(client *govmomi.Client, ns *object.HostNetworkSystem, name string) (*types.HostPortGroup, error) {
  	var mns mo.HostNetworkSystem
  	pc := client.PropertyCollector()
  	ctx, cancel := context.WithTimeout(context.Background(), defaultAPITimeout)
  	defer cancel()
  	if err := pc.RetrieveOne(ctx, ns.Reference(), []string{"networkInfo.portgroup"}, &mns); err != nil {
  		return nil, fmt.Errorf("error fetching host network properties: %s", err)
  	}
  
  	for _, pg := range mns.NetworkInfo.Portgroup {
  		if pg.Spec.Name == name {
  			return &pg, nil
  		}
  	}
  
  	return nil, fmt.Errorf("could not find port group %s", name)
  }
docs: // hostPortGroupFromName locates a port group on the supplied HostNetworkSystem
  // by name.