I don't believe mainline kernels support the NAND, and aren't likely to as it is flaky.
I would try whatever the current image is and see what you get.
You are probably going to need a share name after the IP address smb://10.10.2.101/sharename
Running smbclient from the command line will give you more feedback and allow you to search for shares.
Normally your router will be responsible for translating the hostname to an IP address. So if it stops working you should look at your router's DHCP and DNS. Often both will be handled by dnsmasq. Rebooting your RockPro will renew its DHCP lease.