sorry for my English.

I think I understand that:
If I have
Volume_1/PHOTO
Volume_1/VIDEO
Volume_1/PERSONAL
if I want to share with friends the PHOTO folder
I have to share everything to all (Reset Network Shares) or
set the owners for every single folder.
There is no distinction between home LAN and sharing with the internet (browser interface).
I can not restrict access to a subfolder and give him access to the folders above.
example:
I would like to share with friends only PHOTO folder without configuring each PC of my LAN. It is not possible.