Stemcells, Garden, and rootfs: how are these related?



I'm learning about Cloud Foundry's ideas of how to organize applications and how it works under the covers. At the moment I'm having a little trouble understanding the relationship between a few ideas in CF: "rootfs", "Garden", and "stem cells".

Can someone explain:

(1) their understanding of what these ideas are; and
(2) how they are related?

Thank you!

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