You can't login as root user to see the entire contents of the pi's storage. There is code in Netatalk that prevents the root user from logging in.
If you do share the root of the storage system via Netatalk, and if your folder is at the root of the disk and if that folder permits the logged in Appletalk user to list it's content, Netatalk filters that folder out of the listing under the root of the storage aka "/". Aggravating.
For example, if you tell Netatalk to share the root of the storage by adding:
/ "π Tin"
to the /etc/netatalk/Applevolumes.default file on your pi before the # End of File you will likely see a nearly empty volume = your when you open the π Tin volume from your Mac (aka file share, shared folder):

Then for fun, set the "execute" bit off on the /man directory on your pi like this:
sudo chmod o-x /man
That directory or "folder" should have shown under the π Tin volume with a whole bunch of others when you first opened it...but it didn't. Now, after executing the command line above and then opening the π Tin volume, you will magically see the "man" folder show up:
(you may have to "disconnect" and "reconnect" from your Mac to see the changes faster)
But because you told the pi's file system to not allow "others" to "execute" aka display folder contents listing, you can't open it from your Mac regardless of the "read" setting on the folder.

and of course changing it back to allow "execute" hence get a folder contents listing:
sudo chmod o+x /man
results in the folder disappearing from theπ Tin volume aka root of the pi's boot volume you are looking at on your Mac desktop:

(note, you can add a file to the pi's storage root and it shows up fine so you know it is working... feature-error.jpg for example)
Cannot login as root to see the whole pi. Cannot see the root of the disk. Both intentional. Here is the code in Netatalk that keeps the 'root' user from logging in for example: auth.c file under GitHub see line 224
How many wasted hours have how many people put in discovering this artificial set of limitations?