I created a new share called "files", which is on my new ZFS pool. That created a dataset on the pool with the same name. With the ZFS Master plugin, I created a new dataset files/something. I can access both folders over SMB from Windows, but I don't have permission to write to files/something, only to "files". Is there a fix for this? or should I just avoid nesting datasets like this, and create "something" as it's own seperate share instead?

That look's more like a question for the plugin support thread, but check the permissions for the nested dataset and adjust if needed.

There isn't really a permission to set on the dataset. I was expecting it to have the same permission as the share it lies in. Will make a post in the plugin support thread.

I don't use the plugin, don't know if the datasets are created with the same owner, but they should, post the output of:

 

ls -l pool_name/files