Do not render parent of root directory

cmd/s3-genindex/main.go

@@ -269,17 +269,22 @@ func generateS3HTML(entries []indexgen.FileEntry, opts *indexgen.Options, client
 		return fmt.Errorf("failed to get HTML template")
 	}
 
+	// Determine if we're at root level (no parent directory)
+	isRoot := (indexKey == opts.OutputFile) // root level index.html
+	
 	// Prepare template data (similar to ProcessDir in indexgen)
 	data := struct {
 		DirName    string
 		Entries    []indexgen.FileEntry
 		DirAppend  bool
 		OutputFile string
+		IsRoot     bool
 	}{
 		DirName:    opts.TopDir, // Use bucket name as directory name
 		Entries:    entries,
 		DirAppend:  opts.DirAppend,
 		OutputFile: opts.OutputFile,
+		IsRoot:     isRoot,
 	}
 
 	// Generate HTML content in memory