Welcome, Jeremy!
No. Not really. The recommended solution would be to create a separate category (and group to control access) for each micro group.
You might be able to do a crazy work around where people are set to ignore users not in their micro group (given that they will never need to interact with those not in their group).
It would take a custom plugin. I’ve not thought about it enough to know whether it’s a $500 problem or a $1500 one. If you have such a budget you can post in Marketplace.