code: func RemoveObjectManagedFields(obj runtime.Object) {
  	accessor, err := meta.Accessor(obj)
  	if err != nil {
  		panic(fmt.Sprintf("couldn't get accessor: %v", err))
  	}
  	accessor.SetManagedFields(nil)
  }
docs: // RemoveObjectManagedFields removes the ManagedFields from the object
  // before we merge so that it doesn't appear in the ManagedFields
  // recursively.