H5P_GET_NFILTERS returns the number of filters defined in the filter pipeline associated with the property list
In each pipeline, the filters are numbered from 0 through N-1, where N is the value returned by this function. During output to the file, the filters are applied in increasing order; during input from the file, they are applied in decreasing order.
H5P_GET_NFILTERS returns the number of filters in the pipeline, including zero (
0) if there are none.