/// Contains callbacks error types.
/// Contains traits extending common structs from the [std].
/// Contains the [SyncFilter][crate::filter::SyncFilter] and [Filter][crate::filter::Filter] traits
/// and related structs.
/// Contains the [Metadata][crate::metadata::Metadata] struct.
/// Contains the [Placeholder][crate::placeholder::Placeholder] struct.
/// Contains the [PlaceholderFile][crate::placeholder_file::PlaceholderFile] struct.
/// Contains the sync root structs.
/// Contains low-level structs for directly executing Cloud Filter operations.
///
/// The [command][crate::command] API is exposed through various higher-level structs, like
/// [Request][crate::request::Request] and [Placeholder][crate::placeholder::Placeholder].