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Updating number of cpu cores

I am currently working on a resource update project which contains docker containers. I can update the Ram limits of containers, I also tried to decrease the number of CPU cores that each container used. But even if my command works without error, CPU cores do not change and containers use all available cores in the system.

I wonder, is there any capability of Docker that updates number of CPU cores in the desired number or is this feature planned to be added?