implementations of features like "Call hierarchy", "find all implementations"

[noone1235]

I am trying to implement a plugin which can convert C# code to Sequence UML diagram. I want to know if there are any APIs which can help me extract the flow/ sequences of the code easier.
Something like "find all implementations", "call hierarchy" kind of features that are implemented can help me a lot, are these features implemented in this extension?

[Ador-able]

Hope to get support for Call hierarchy.

[dibarbet]

Call hierarchy is tracked here - #6297 (if you'd like this, please upvote).

Find all implementations should already be supported.