nixos/stage-1.init.sh: only remount bind fsType

We should not remount all filesystem types since not all filesystems
are safe to remount and some (nfs) return errors if remounted with
certain mount options.

nixos/modules/system/boot/stage-1-init.sh

@@ -423,8 +423,16 @@ mountFS() {
 
     # For bind mounts, busybox has a tendency to ignore options, which can be a
     # security issue (e.g. "nosuid"). Remounting the partition seems to fix the
-    # issue.
-    mount "/mnt-root$mountPoint" -o "remount,$optionsPrefixed"
+    # issue. This should only be done for bind and rbind mountpoints because other
+    # filesystems may have limitations or may not support remount.
+    local IFS=,
+    for opt in $options; do
+        if [[ "$opt" = bind || "$opt" = rbind ]]; then
+            mount "/mnt-root$mountPoint" -o "remount,$optionsPrefixed"
+            break
+        fi
+    done
+    unset IFS
 
     [ "$mountPoint" == "/" ] &&
         [ -f "/mnt-root/etc/NIXOS_LUSTRATE" ] &&