Versioning multiple projects with versioneer within a single git repository

Question

I have a single, large git repo with many different projects (not submodules). A few of these projects are Python projects for which I'd like to track versioning with Python's versioneer, others may be completely independent projects (say, in Haskell). i.e. The directory structure looks like this:

myrepository
├── .git
├── README.md
├── project1/
│   ├── project1/
│   │   ├── __init__.py
│   │   └── _version.py
│   ├── versioneer.py
│   ├── setup.cfg
│   └── setup.py
├── project2/
├── project3/
└── project4/
    ├── project4/
    │   ├── __init__.py
    │   └── _version.py
    ├── versioneer.py
    ├── setup.cfg
    └── setup.py

This doesn't play well with versioneer because it can't discover the .git directory at the project root level, so I get a version of 0+unknown.

Questions:

1. Is there a suggested way to use versioneer with a single monolithic repo with multiple projects?

2. Depending on the answer to the above, is it recommended that my git tags read like: project1-2.1.0, project2-1.3.1, or should I unify the git tags like: 1.2.1, 1.2.2?