Generating automodsumm for main package directory

I have developed a package which for the most part contains functions in different modules within the package. I am documenting these functions wonderfully using automodsumm. But the package also has some base functions which are available using package_name.function1, package_name.function2, etc. I would also like to add these to my documentation in the same format as automodsumm, but I have not been able to figure out how to reference the top level of the package to generate the proper documentation.

I tried (and all possible deviations there of):

```
.. automodsumm:: package_name
:toctree: my title
:functions-only:
```

But this leads to an issue with the import. How can I specify that it is supposed to document all the functions included in the package itself? I sadly couldn't find anything in the documentation about this.

Start with the automodsumm directive and the package_name entry point shown in the issue, then inspect the extension's documented handling of package-level objects. Reproduce the import failure with a minimal package and verify the generated API documentation; done means top-level functions are listed in the same format without an import error.

Written by the indexing model from the issue text.