Here is the example:
https://raw.githubusercontent.com/dateutil/dateutil/master/docs/index.rst

And the result is:
https://dateutil.readthedocs.org/en/latest/

Notice - subsections in a tree side-bar are absent.

Similar issues on SO:
http://stackoverflow.com/questions/27338257/using-self-in-sphinx-toctree-doesnt-include-sub-sections
http://stackoverflow.com/questions/20648956/adding-subsections-of-self-in-the-table-of-contents