The My Cloud User Manual for the second gen v2.x single bay My Cloud units (http://products.wdc.com/library/UM/ENG/4779-705147.pdf) does mention NFS and shows it as a setting on the My Cloud Dashboard > Shares page in Chapter 7, Managing Shares.
Additionally if one uses the forum search feature, magnifying glass icon upper right, they will find a number of past discussions on using NFS and the My Cloud. Here are just a few past discussions:
http://wdstagingsplit.staged-by-discourse.com/t/nfs-access-mycloud-gen-2/159622
http://wdstagingsplit.staged-by-discourse.com/t/nfsv4-on-my-cloud/156862
There are more threads on NFS that can be found using the forum search option (magnifying glass icon upper right). Here are a few:
http://wdstagingsplit.staged-by-discourse.com/t/nfs-mount-out-of-space/154744
http://wdstagingsplit.staged-by-discourse.com/t/mount-share-using-nfs-in-windows-10-ultimate/149308
