type: clusterMode, default: local
If clusterrank=local, a subgraph whose name begins with cluster is given special treatment.
The subgraph is laid out separately, and then integrated as a unit into its parent graph, with a bounding rectangle drawn about it. If the cluster has a label parameter, this label is displayed within the rectangle.
Note also that there can be clusters within clusters.
The modes clusterrank=global and clusterrank=none appear to be identical, both turning off the special cluster processing.
Note: dot only.
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https://www.graphviz.org/docs/attrs/clusterrank/