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src/modules/filesystem.md

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+# Filesystem Hierarchy
+
+The module content can be omitted:
+
+```rust,editable,compile_fail
+mod garden;
+```
+
+The `garden` module content is found at:
+
+* `src/garden.rs` (modern Rust 2018 style)
+* `src/garden/mod.rs` (older Rust 2015 style)
+
+Similarly, a `garden::vegetables` module can be found at:
+
+* `src/garden/vegetables.rs` (modern Rust 2018 style)
+* `src/garden/vegetables/mod.rs` (older Rust 2015 style)
+
+The `crate` root is in:
+
+* `src/lib.rs` (for a library crate)
+* `src/main.rs` (for a binary crate)