I guess the question is really relative to whether or not we are talking HNAS or strictly block level OS.the linux df man page provides:
list inode information instead of block usage
For HNAS when using 'df -i' against a mount point, you are unlikely to receive anything you "might expect"; the output is not going to be analogous to Linux or NetApp.
> When -i option is used, each line of the output includes the following columns:
> “Filesystem” - The name of the filesystem.
> “Inodes” - The total number of inodes on the file system.
> “IUsed” - The number of used inodes.
> “IFree” - The number of free (unused) inodes.
> “IUse%” - The percentage of used inodes.
> “Mounted on” the directory on which the filesystem is mounted.
The useful data observed at the Linux level against HNAS share is "Filesystem" and "Mounted on", but not Inodes.