A type hint for the instance variable defined at parent class is not shown in the document of the derived class.

[tk0miya]

Describe the bug
A type hint for the instance variable defined at parent class is not shown in the document of the derived class.

To Reproduce

# example.py
class Foo:
    var1: int

    def meth(self):
        pass


class Bar(Foo):
    pass

# index.rst
.. automodule:: example
   :members:
   :undoc-members:
   :inherited-members:

Output:

Expected behavior
A type hint is shown.

Your project
No

Screenshots
No

Environment info

• OS: Mac
• Python version: 3.8.2
• Sphinx version: HEAD of 3.x
• Sphinx extensions: sphinx.ext.autodoc