curl --request GET \
  --url https://sbx-{sandbox_id}-{workspace_id}.{region}.bl.run/filesystem/tree/{path} \
  --header 'Authorization: Bearer <token>'

{
  "files": [
    {
      "group": "<string>",
      "lastModified": "<string>",
      "name": "<string>",
      "owner": "<string>",
      "path": "<string>",
      "permissions": "<string>",
      "size": 123
    }
  ],
  "name": "<string>",
  "path": "<string>",
  "subdirectories": [
    {
      "name": "<string>",
      "path": "<string>"
    }
  ]
}