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QDirStat
QDirStat - Qt-based directory statistics (KDirStat without any KDE - from the original KDirStat author)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You can obviously do it separately on each share. You can use Storage Analyzer to get some of the functionality, but it's not quite as easy as WinDirStat or the like. If you've got some time and willingness to experiment, you can probably get qdirstat (https://github.com/shundhammer/qdirstat) to run in Docker, and mount the volume in a way to analyze it.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.