Add ability to cut the parents chain off

[OnkelTem]

Sometimes it is needed to just break state chain at some point.
I think passing { parent: false; } is the most straightforward and intuitive way for doing this.

[ncuillery]

Hi, thanks for the PR. It looks good to me and work well with the sample.

Please, can you add tests ?

Here is some guidelines.

• Additional state in this test module with parent: false
• Additional it in this spec