code: public function unlink($path)
      {
          $this->getStorageClient($path)->deleteBlob(
              $this->getContainerName($path),
              $this->getFileName($path)
          );
  
          // Clear the stat cache for this path.
          clearstatcache(true, $path);
          return true;
      }
docs: Attempt to delete the item
  
  @param  string $path
  @return boolean