Fallback to ModTime if ChangeTime cannot be determined

Also directly add ChangeTime to the file struct instead
`times.Timespec`

nav.go

@@ -27,10 +27,10 @@ const (
 
 type file struct {
 	os.FileInfo
-	linkState linkState
-	path      string
-	dirCount  int
-	times     times.Timespec
+	linkState  linkState
+	path       string
+	dirCount   int
+	changeTime time.Time
 }
 
 func readdir(path string) ([]*file, error) {
@@ -65,17 +65,19 @@ func readdir(path string) ([]*file, error) {
 			}
 		}
 
+		// fall back to ModTime if ChangeTime cannot be determined
+		ct := lstat.ModTime()
 		ts, err := times.Stat(fpath)
-		if err != nil {
-			return files, err
+		if err == nil {
+			ct = ts.ChangeTime()
 		}
 
 		files = append(files, &file{
-			FileInfo:  lstat,
-			linkState: linkState,
-			path:      fpath,
-			dirCount:  -1,
-			times:     ts,
+			FileInfo:   lstat,
+			linkState:  linkState,
+			path:       fpath,
+			dirCount:   -1,
+			changeTime: ct,
 		})
 	}
 
@@ -135,7 +137,7 @@ func (dir *dir) sort() {
 		})
 	case ctimeSort:
 		sort.SliceStable(dir.files, func(i, j int) bool {
-			return dir.files[i].times.ChangeTime().Before(dir.files[j].times.ChangeTime())
+			return dir.files[i].changeTime.Before(dir.files[j].changeTime)
 		})
 	}