The mergerfs technology is for logically joining folder trees perhaps on separate disks and presenting them as one consolidated disk folder tree.
This project uses mergerfs to present folder trees on 2 separate USB drives as one consolidated folder tree served up by an NFS share and a SAMBA share.
There currently are no NFS shares serving folders from the individual disk folders (although that may come in a later release).
The individual SAMBA shares still point to the 'root folder' of each individual disk, allowing files to be copied to a specific disk folder of the copier's choice.
There now a SAMBA share serving folders from mergerfs.
In some cases, a folder/file may be duplicated on the second disk so that it is a backup of the file on the first disk - mergerfs will not serve up the duplicate second disk file.
Hence the individual SAMBA shares become useful in that scenario.
Issue:
If you answered "N" to the "do you have a second disk" question and later cancel/re-run the script, then the default values for the second disk will be seen to be incorrect.
To workaround that, delete the file setupNAS_defaults.config in ~/Desktop before re-running the script.