pkg io/fs, type DirEntry interface, Type() FileMode
pkg io/fs, type FS interface { Open }
pkg io/fs, type FS interface, Open(string) (File, error)
pkg io/fs, type File interface { Close, Read, Stat }
pkg io/fs, type File interface, Close() error
pkg io/fs, type File interface, Read([]uint8) (int, error)
pkg io/fs, type File interface, Stat() (FileInfo, error)
pkg io/fs, type FileInfo interface { IsDir, ModTime, Mode, Name, Size, Sys }