How do I share an Ubuntu Ext4 partition in a VMWare VM, with another VM?

I am running VMware Workstation 16 Pro on my W11 PC. I have several VMs, including a Ubuntu 22.04.4 LTS VM, and a Solaris 10 VM (sadly still needed for legacy projects). I need to allow the Solaris VM access (full RW permissions) to my "/" partition (ext4, /dev/sda3) in the Ubuntu VM. First, is this even possible? If so, what are the steps necessary for this to happen? On the Ubuntu VM, I went to Settings -> Sharing, enabled Sharing, and then went into Media Sharing, and shared the folder /, and enabled Wired connection 1. In the Solaris VM created the folder /etc/nfs/ub22 (as root), I su'd to root and entered mount -F nfs 192.168.18.107:/ /etc/nfs/ub22 (1921.68.18.107 is the IP of the Ubuntu VM) but I get the error nfs mount: 192.168.18.107: : RPC: Rpcbind failure - RPC: Unable to receive