vserver fpolicy policy scope create:
https://docs.netapp.com/us-en/ontap-cli-93/vserver-fpolicy-policy-scope-create.html#description
Your query: if its possible to set fpolicy on just a NTFS folder.
A Scope: Can include or exclude files based on shares, export policies, volumes, and file extensions. Regarding your query, I don't think you specify a specific 'folder', as a scope but you can include a 'share' if that helps.