Access React tree from within a component

Is there a way to access the React tree down a component from within it? For instance when I use the React-devtool extension I am able to navigate along the React tree. Is it possible to do such navigation from within the code of a component to know everything below it?

I know about children, but it does not work when parents components simply render children components, ie in Parent component I have something like

   render() {
       <Child1 />
   }

then in Child1 component I have

   render() {
       <Child2 />
   }

etc.

and I'd like to know from Parent that there is below a Child1 and then a Child2 .

I have had a look at this._reactInternalInstance._instance._renderedComponent._currentElement where I can see that, for instance, Parent renders a Child1 . But from this I cannot go further to see what Child1 renders.

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