[Python] How to forbid to loading conftest files in upper directories

I have structure like this:

conftest.py
dir/conftest.py
dir/test_my.py


When I change directory to dir and run py.test test_my.py, my tests start with configuration, declared in the outer conftest.py (which is out of dir). Is there any way to change pytest behaviour: to load conftest-file only from the local directory?

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