code: static boolean isCreatorType(Element element, Elements elements, Types types) {
      TypeMirror creatorType = types.getDeclaredType(
          elements.getTypeElement(PARCELABLE_CREATOR_CLASS_NAME),
          types.getWildcardType(null, null));
      return types.isAssignable(element.asType(), creatorType);
    }
docs: Returns true if {@code element} is a {@code Parcelable.Creator} type.