I set up a generally working samba server on a Linux machine like this:

useradd -g users netshareuser

passwd netshareuser

smbpasswd -a netshareuser

(passwords are the same)

mkdir /net/share

chown -R root:users /net/share

chmod -R g+rwxs /net/share

setfacl -R -m default:user::rwx,default:group::rwx,default:mask::rwx,default:other::--- /net/share

/etc/samba/smb.conf:

    [global]
    workgroup = workgroup
    server string = server
    security = user
    hosts allow = 192.168. 127.
    load printers = no
    log file = /var/log/samba/%m.log
    max log size = 50
    dns proxy = no
    printing = bsd
    printcap name = /dev/null
    disable spoolss = yes

    unix extensions = no
    follow symlinks = yes
    wide links = yes

    [share]
    comment = Directory containing shared files
    path = /net/share
    valid users = netshareuser
    read only = yes

rc.d restart samba

From a Windows (7) machine, "netshareuser" can access this share, read files and directories. However, If I create a symlink ln -s /some/directory/ /net/share/nameOfSymlink, the same Windows machine would not even display it.

Questions:

1. What do I have to do, to get Linux symlinks in that share to work on windows machines and is that even possible?
   UPDATE: This question has been answered by ultrasawblade! The problem were wrong permissions on /some/directory

2. Is there some way of sharing files with samba, that does not require to change file permissions? I mean a way, where you can share any file on your linux system to anyone on your network but without changing this file's permissions. What I want is: Tag a file as shared to "netshareuser", without changing the permissions of that file.

Thanks in advance for any suggestions!