public FileSystemInterface::dirname($uri)
Gets the name of the directory from a given path.
PHP's dirname() does not properly pass streams, so this function fills that gap. It is backwards compatible with normal paths and will use PHP's dirname() as a fallback.
Compatibility: normal paths and stream wrappers.
string $uri: A URI or path.
string A string containing the directory name.
dirname()
https://www.drupal.org/node/515192
public function dirname($uri);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!File!FileSystemInterface.php/function/FileSystemInterface::dirname/8.1.x