@Divyanshu Gupta Apologies for the delay response!
When you create an SSD file share, you have a choice between the SMB and NFS protocol. After you’ve created the file share, this property is unchangeable. NFS file shares do not support FileREST today. It has nothing to do with NFS clients having mounted the share with NFS, it just doesn’t support FileREST at all.
We are adding support for FileREST on NFS file shares. The primary reason we are doing this is to enable value added services, like Azure Backup or Storage Mover, on NFS file shares. This should be coming later this year. We don’t have an ETA for now.
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