code: public static ObjectGraph create(MortarScope parent, Object... daggerModules) {
      ObjectGraph parentGraph = getObjectGraph(parent);
  
      return parentGraph == null ? ObjectGraph.create(daggerModules)
          : parentGraph.plus(daggerModules);
    }
docs: Create a new {@link ObjectGraph} based on the given module. The new graph will extend
  the graph found in the parent scope (via {@link ObjectGraph#plus}), if there is one.