No, that’s not possible. The only thing which you can do is, to configure a general share folder for all users under which individual shared files and folders are stored. Check out the following configuration parameter:
I don’t use my NC it that way.
I have one account used on many computers to sync files, a mix of Linux and Windows.
You sometimes have a lot file generated conflicts come up as a result of this way but it’s getting less as NC updates…
You need to check each conflicting file and delete the incorrect one. Not just deleting the conflicting files by name (I used to do that).