Restrict analysis to the cluster scope

[carlduevel]

I am working with clusters where my access rights are constrained to the namespace level. I tried to use rbac-tool in that context, but I did not find an option to constrain the commands to the ns only. For example:
rbac-tool visualize --include-namespaces my-ns --cluster-context my-ctx
leads to
serviceaccounts is forbidden: User "myuser" cannot list resource "serviceaccounts" in API group "" at the cluster scope

Is there any option/setting I have overlooked to make this happen?