It appears to work, as long as there is enough RAM in your Mac. My installation is MacOS 10.14.3, Fusion 11.0.2 and Docker Desktop 2.0.3.0. I am running Ubuntu servers in both environments simultaneously. For example, I can ping the server running under Fusion from the Ubuntu server container within Docker Desktop.
I have not been able to find any information about this being a supported configuration, so your mileage may vary.