fixup! fs: introduce dirent.parentPath

lib/internal/fs/dir.js

@@ -155,6 +155,7 @@ class Dir {
           path,
           result[i],
           result[i + 1],
+          true, // Quirk to not introduce a breaking change.
         ),
       );
     }

lib/internal/fs/utils.js

@@ -234,7 +234,7 @@ function join(path, name) {
   }
 
   if (typeof path === 'string' && typeof name === 'string') {
-    return pathModule.basename(path) === name ? path : pathModule.join(path, name);
+    return pathModule.join(path, name);
   }
 
   if (isUint8Array(path) && isUint8Array(name)) {
@@ -313,9 +313,13 @@ function getDirent(path, name, type, callback) {
   } else if (type === UV_DIRENT_UNKNOWN) {
     const filepath = join(path, name);
     const stats = lazyLoadFs().lstatSync(filepath);
-    return new DirentFromStats(name, stats, path, filepath);
-  } else {
+    // callback === true: Quirk to not introduce a breaking change.
+    return new DirentFromStats(name, stats, path, callback === true ? filepath : path);
+  } else if (callback === true) {
+    // callback === true: Quirk to not introduce a breaking change.
     return new Dirent(name, type, path);
+  } else {
+    return new Dirent(name, type, path, path);
   }
 }