ENH: Added multi index functionality (new level kwarg) to Dataframe.filter
- [x] closes #42970
- [x] tests added / passed
- [x] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing.html#code-standards) for how to run them
- [ ] whatsnew entry

Hello @ShreyasPatel031! Thanks for updating this PR. We checked the lines you've touched for [PEP 8](https://www.python.org/dev/peps/pep-0008) issues, and found:







There are currently no PEP 8 issues detected in this Pull Request. Cheers! :beers: 

##### Comment last updated at 2021-08-30 14:31:03 UTC This pull request is stale because it has been open for thirty days with no activity. Please update or respond to this comment if you're still interested in working on this. @ShreyasPatel031 can you fix ci fails and resolve merge conflicts. @ShreyasPatel031 there's a xlsx binary shown in the diff. this is not part of this PR? Appears this PR has gone stale, so closing. If interested in continuing, please merge master, address the review and failing tests and we can reopen.