add /home mnt

configuration.nix

@@ -78,6 +78,13 @@
   # Enable touchpad support (enabled default in most desktopManager).
   # services.xserver.libinput.enable = true;
 
+  fileSystems."/home"= {
+
+     device = "files:/mnt/default/homes";
+     fsType = "nfs";
+
+  }
+
   # Define a user account. Don't forget to set a password with ‘passwd’.
   users.users.petra = {
     isNormalUser = true;