It isn't so much that it isn't supported, despite appearing as different folders, they are actually hard links to the same inode.  Therefore, they are seen by the OS as conflicting/overlapping NFS exports.  Thinking about it a bit, what you could consider though is creating an NFS export for:  /ifs/.snapshot  Then also enabling the option: "Enable mount access to subdirectories".  Let's see what others suggest.
I tried to export serval snapshot to one same host by NFS, the first snapshot directory had exported without error, and I mounted it at the  NFS client host,  when I tried to export another snapshot directory, it failed with error: ================================================================== ================================================================== I had executed: isi snapshot snapshot view 6 to ensure the export were used the different directories, I want to know if snapshot direcoty NFS export is supported or not,  thanks in advanced for your answer.
Snapshot directory NFS export question