public synchronized boolean isFilesystemMountedAt(FSRL containerFSRL) {
		for (Entry<FSRLRoot, FSCacheInfo> entry : filesystems.entrySet()) {
			FSRLRoot fsFSRL = entry.getKey();
			FSRL fsContainer = fsFSRL.getContainer();

			FileSystemRef ref = entry.getValue().ref;
			GFileSystem fs = ref.getFilesystem();
			if (fs == null || fsContainer == null) {
				continue;
			}

			if (fsContainer.isEquivalent(containerFSRL)) {
				return true;
			}
		}
		return false;
	}
Returns true if there is a filesystem in the cache that has a containerFSRL that
is {@link FSRL#isEquivalent(FSRL) equiv} to the specified FSRL.

@param containerFSRL {@link FSRL} location to query for currently mounted filesystem.
@return true if there is a filesystem mounted using that containerFSRL.
Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/FileSystemInstanceManager.java