ErrDirectoryInvalid is being used whenever a given directory is invalid.

ErrFileNotReadable is being used whenever a file handler is not readable.

ErrFileNotRemovable is being used whenever a file handler is not removable.

ErrFileNotWritable is being used whenever a file handler is not writable.

Filesystem defines the configuration of the filesystem storage backend type.

OSFile implements a File using operating system handlers.

File defines file system operations.