Thredds Data Server TDS provides getCapabilities for a netCDF file.
e.g. http://localhost:8080/thredds/wms/testAll/Filename.nc?service=WMS&version=1.3.0&request=GetCapabilities
Here, the filename would be a netCDF dataset present at this location in tomcat.
tomcat/content/thredds/public/testdata
Is there a way where I can display all layers getCapabilities document like it is explicitly available by ncWMS server. eg. http://localhost:8080/ncWMS2/wms?SERVICE=WMS&REQUEST=GetCapabilities&VERSION=1.1.1
Each dataset on THREDDS has a separate WMS endpoint with separate getCapabilities response.
So if you wanted to get all the WMS layers from all the datasets on a THREDDS server, you would need to crawl the THREDDS catalog, retrieving all the WMS endpoints, and then query each WMS endpoint individually with GetCapabilities to get all the layers (variables) for each dataset.