logback-android/src/main/java/ch/qos/logback/core/rolling/helper/FileStoreUtil.java
static public boolean areOnSameFileStore(File a, File b) throws RolloverFailure {
    if (!a.exists()) {
      throw new IllegalArgumentException("File [" + a + "] does not exist.");
    }
    if (!b.exists()) {
      throw new IllegalArgumentException("File [" + b + "] does not exist.");
    }

// Implements the following by reflection
//    Path pathA = a.toPath();
//    Path pathB = b.toPath();
//
//    FileStore fileStoreA = Files.getFileStore(pathA);
//    FileStore fileStoreB = Files.getFileStore(pathB);
//
//    return fileStoreA.equals(fileStoreB);

    try {
      Class<?> pathClass = Class.forName(PATH_CLASS_STR);
      Class<?> filesClass = Class.forName(FILES_CLASS_STR);

      Method toPath = File.class.getMethod("toPath");
      Method getFileStoreMethod = filesClass.getMethod("getFileStore", pathClass);


      Object pathA = toPath.invoke(a);
      Object pathB = toPath.invoke(b);

      Object fileStoreA = getFileStoreMethod.invoke(null, pathA);
      Object fileStoreB = getFileStoreMethod.invoke(null, pathB);
      return fileStoreA.equals(fileStoreB);
    } catch (Exception e) {
      throw new RolloverFailure("Failed to check file store equality for [" + a + "] and [" + b + "]", e);
    }
  }
static public boolean areOnSameFileStore(File a, File b) throws RolloverFailure {
    if (!a.exists()) {
      throw new IllegalArgumentException("File [" + a + "] does not exist.");
    }
    if (!b.exists()) {
      throw new IllegalArgumentException("File [" + b + "] does not exist.");
    }

// Implements the following by reflection
//    Path pathA = a.toPath();
//    Path pathB = b.toPath();
//
//    FileStore fileStoreA = Files.getFileStore(pathA);
//    FileStore fileStoreB = Files.getFileStore(pathB);
//
//    return fileStoreA.equals(fileStoreB);

    try {
      Class<?> pathClass = Class.forName(PATH_CLASS_STR);
      Class<?> filesClass = Class.forName(FILES_CLASS_STR);

      Method toPath = File.class.getMethod("toPath");
      Method getFileStoreMethod = filesClass.getMethod("getFileStore", pathClass);


      Object pathA = toPath.invoke(a);
      Object pathB = toPath.invoke(b);

      Object fileStoreA = getFileStoreMethod.invoke(null, pathA);
      Object fileStoreB = getFileStoreMethod.invoke(null, pathB);
      return fileStoreA.equals(fileStoreB);
    } catch (Exception e) {
      throw new RolloverFailure("Failed to check file store equality for [" + a + "] and [" + b + "]", e);
    }
  }
This method assumes that both files a and b exists.

@param a first file
@param b second file
@return whether files are on same store
@throws IllegalArgumentException