You don’t actually need to share the C drive but only reinstall (or potentially even uncheck – click OK – then check) the File and Print sharing service on the Hyper-V virtual network card.
See this article.
Also if there are restrictions on your network profiles (i.e. public), consider changing the default “unidentified network” for the “vEthernet (DockerNAT)” card to private via this PowerShell command before doing the above:
Set-NetConnectionProfile -interfacealias "vEthernet (DockerNAT)" -NetworkCategory Private