Quicktime Image IO and JPEG Chroma Subsampling

This is more of a developer question than a user question, but hopefully someone here will be able to answer it.
I'll use the example of using Quicktime Image IO to save JPEGs in an application. There will be a scale of "Least, Low, Medium, High, Best" (basically, a scale from 1 to 100) for setting quality. I need to know at what point (at what quality level) JPEG chroma subsampling is turned off (or, worded another way, at what point JPEG chroma subsampling is set to 4:4:4).
Thanks

currentFrameImage

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