FindInParents Returns the first occurrence of filename going up the dir tree.

IsCaseInsensitiveLocation returns true if dirPath is a directory on a case-insensitive filesystem.

IsDir Returns true if p is a directory, otherwise false.

PruneEmptyDirectories iterates through the directory tree, removing empty directories, and directories that only contain empty directories.

VerifySafeFilename checks that the given file name is absolute and does not contain path traversal.

OSFS is the filesystem of the OS.

FS is a tiny filesystem abstraction.

RewindableReader allows repeatedly reading the same stream.

WriterThenReader writes data to storage, then allows reading it.