sphinx autodoc include subfunctions

Question

I want to automatically include subfunctions of a function in the sphinx documentation. What is the option for this?

My code looks like

import numpy
def mainfunc():
    """ to be documented 

    """

    def subfunc():
        """ to be documented as well

        """

By now I set in the included code.rst

Code Reference
==============

.. automodule:: lqgbt_lnse
   :members:

But the output by sphinx includes only the mainfunction.