Oh, with ioutil.ReadDir subtracting of 4096 isn't needed.

pkg/utils/filesize.go

@@ -38,6 +38,5 @@ func DirectorySize(path string) (dirSz int64, err error) {
 		dirSz += entry.Size()
 	}
 
-	// Here we subtract a size of a directory's inode to get size of files only.
-	return dirSz - 4096, nil
+	return dirSz, nil
 }