What type of NoSQL database is best suited to store hierarchical data?

Question

What type of NoSQL database is best suited to store hierarchical data?

Say for example I want to store posts of a forum with a tree structure:

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Answer 1

Just spent the weekend at a training course using MUMUPS db as a back-end for a full stack javascript browser application development framework. Great stuff! I'd recommend GT.M distro of MUMPS under GPL. Or try http://sourceforge.net/projects/mumps/?source=recommended for vanilla MUMPS. Check out http://robtweed.wordpress.com/ for ewd.js js framework and more info on MUMPS.