code: @Override
      public final Iterable<RootDocument> findAll(
              final RootDocument rootDocument) {
          final Iterable<RootDocument> rootDocuments =
                  findAll(rootDocument.getFilename());
          if (rootDocuments == null) {
              return null;
          }
          for (final RootDocument rootDocumentOut : rootDocuments) {
              final Root root = rootDocumentOut.getGedObject();
              root.setParent(rootDocumentOut.getGedObject());
          }
          return rootDocuments;
      }
docs: {@inheritDoc}