This takes place about midway through Black Root Burrows, after you have acquired Charge Dash. You trigger the boulder by running under it and will have to jump over an obstacle and under several blocks that will drop. It's good to get used to your Charge Dash here to get through it quickly so you can get out of the way of the boulder. Climb the wall at the end and make sure you're high enough up on the wall so as to avoid the splash damage from the boulder crashing into the last wall
Below is a video showing how I did this:
Any negative comments, let me know how I could improve this solution.