Disabling 'Missing or empty docstring'-warning for file level docstrings only

Hello,

I want to disable that warning because I figured I am pretty much duplicating the docstrings of the classes and functions in my module.

As of today, I have only figured out how to disable that warning for all docstrings, which is obviously not what I want.

I appreciate your efforts! 

By the way: Is it common to not write module level docstrings? I have rarely seen them. If it is, why should you? Which extra information do they provide which is actually useful?