There will be an instance of vsepflt for each volume that it is monitoring.
The list of all volumes the windows filter manager sees can be show by running the "fltmc volumes" command at an administrator command prompt.
Running fltmc instances | find "vsepflt" will list each instance of the vsepflt thin driver and which volume it is associated with.
The number shown in the altitude column represents the order where filters are processed in the stack. There are specific altitude ranges to allow drivers that need to run before others are guaranteed to be processed in the correct order. The allocation of altitudes to minifilter drivers is managed by Microsoft.