Before solving this issue, I think it would be best to think on a more generic solution on how to make Pathlib more extensible. Related to: https://discuss.python.org/t/make-pathlib-extensible/3428

For instance, if childs created with `p.parent()`, `p / 'subdir'` need to forward some state (e.g. `RemotePath(path, password=, user=)`).

Rather than __init__, maybe there should be some __post_init__ like dataclasses.