Thanks to Matthew and Sabine for their suggestions, which sadly are not solving my problem :). After some more reading and learning I've come up with another way which I'll describe below for those who are interested.

I skipped the idea of extensive read & write list parameters in the smb.conf and now handle almost everything with standard unix permissions, particularly by using the sgid bit on directories (which I never used before -- shame on me). In addition to the [homes] service I made a service called [users] which serves as a place for symlinks to the desired home directories. By mounting this share, my user "tim" can see the homes of joe, kate and himself, and can read (and write, if he is in the group "kate" resp. "joe").

My smb.conf:

[homes]
        valid users = @users
        write list = @%g
        read only = No
        inherit acls = Yes
        browseable = No
        create mask = 0664
        force create mode = 020
        directory mask = 0775
        force directory mode = 020

[users]
        path = /home/server/userlinks
        valid users = @users
        read only = no
        create mask = 0664
        force create mode = 020
        directory mask = 0775
        force directory mode = 020

# ls -l /home | grep joe
drwxrwsr-x   4 joe    joe    152 Feb  2 16:56 joe

# ls -l joe/
drwxrwsr-x   5 joe    joe    176 Feb  2 21:26 .
drwxr-xr-x  18 root   root   424 Feb  2 21:26 ..
drwx------   2 joe    root   136 Feb  2 14:36 secret
drwxr-sr-x   2 root   joe     48 Feb  2 21:26 test

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