Add script to compare customer's mount options with our NFS docs

What does this MR do and why?

See title & USAGE in diff ;-)

How to set up and validate locally

See USAGE in diff ;-)

MR acceptance checklist

• I've tested this change on: macOS /Linux.
• This change needs no other test and thus no review, because: …justification…. I'll merge it myself.
  • This does need at least 1 additional test on another machine, ideally using a different OS. I've facilitated this via: Slack thread / MR review.