@Override
	public void close() throws IOException {
		refManager.onClose();

		provider.close();
		provider = null;
	}
Closes the file system.
All resources should be released. (programs, temporary files, etc.)
@throws IOException if an I/O error occurs
Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/GFileSystemBase.java