1) Package filter to include all numeric level 1 nodes (relative to parent folder) and exclude sub nodes
2)
<?xml version="1.0" encoding="UTF-8"?>
<workspaceFilter version="1.0">
<filter root="/content/dam/experience-aem">
<include pattern="/content/dam/experience-aem/[1-9].*"/>
<exclude pattern="/content/dam/experience-aem/[1-9].*/.*"/>
</filter>
</workspaceFilter>
2)