Identifying user from AWS Sagemaker Studio generated EFS storage

Question

When a sagemaker studio domain is created. An EFS storage is associated with the domain. As the assigned users log into Sagemaker studio, a corresponding home directory is created.

Using a separate EC2 instance, I mounted the EFS storage that was created to try to see whether is it possible to look at each of the individual home domains. I noticed that each of these home directories are shown in terms of numbers (e.g 200000, 200005). Is there a specific rule on how this folders are named? Is it possible to trace the folders back to a particular user or whether this is done by design?

(currently doing exploration on my personal aws account)