Java nio FileSystem change root path

Question

I need to know if there is a way to change the root path of a FileSystem.

I instantiate it like this:

import java.nio.file.FileSystem;
import java.nio.file.FileSystems;

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final Path path = Paths.get(workingFilePath);
final URI uri = URI.create("jar:" + path.toUri());

Filesystem fs = FileSystems.newFileSystem(uri, env);

I did not find any method to do it.

Greetings, Andy