Hey man.
From a very basic point of view, Infuse of course isn’t causing any issue here, InFuse will see what it has permissions to see, so I would check the permission settings on the MBP.
Depends how you have added the share in Infuse and set it up, I’m not sure I follow what you mean. Lets take a simple example of how shares work, this applies generally and not limited to MAC etc.
So below are two paths I made up for the purpose of this reply, they are paths not shares:
Real Path: \naylor-mac\users\naylor\infuse-stuff\movies
Real Path: \naylor-mac\users\naylor\infuse-stuff\tv
So if you are creating a SHARE you would I assume point it to the path folder ‘infuse-stuff’…the result should be that when other devices look for shares they will just look like this:
Share: \naylor-mac\infuse-stuff\
If setup correctly then Infuse will only see ‘infuse-stuff’, and the folders within it when it comes to adding it to Infuse.
The problem could arrise when you see the your server device auto populate in in the ‘Add files’ section at the top, if you click on your server device there then add in your credentials for said device you could be using an account for your MAC which has access to the entire file system anyway. In which case your files are added to Infuse as \naylor-mac\ and then everything after that it will see, you point your favourites to the two folders you want to but when it comes to speed test it will be looking at the \naylor-mac\ path.
I am guessing a little here but really the cleanest way to share folders is to create an additional account on the server side, in your case the MAC, then give this account user rights to the folders you want to share to Infuse, then when adding your share paths to infuse use that account to authenticate and not your normal MAC user account you use day to day. That new account will only have access to those two folders if setup rightt
You are unlikely to come across the same from your NAS because you will authenticate with your NAS shares using a new account anyway and not the MAC account.
Let me know if you have questions so I can clarify.